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The reason is that the bonds C—S and S—S of the asphaltene are the weak link in the macromolecular structure.
The bonds C—O in aromatic ether structure and the double bonds C=O in ester are very stable.
Conclusion (1)By the NMR Analysis ,the aromatic-ring structure is main structural composition in the asphaltene
Journal of Fuel Chemistry and Technology, 2001,29(5):430-432
Journal of Fuel Chemistry and Technology, 2004, 36(6): 668-670

Predicting Impact Sensitivity of Heterocyclic Nitroarenes from Molecular Structures Selected by Genetic Algorithm Wang Rui, Wang Yonggu and Liu Hui College of Education Science and Technology, Zhejiang University of Technology, China hades44@126.com, wangyg@zjut.edu.cn, liu@zjut.edu.cn Keywords: impact sensitivity; heterocyclic nitroarenes; genetic algorithm; molecular structures Abstract.
The optimal subset of the molecular structures descriptors were selected by genetic algorithm (GA).
The optimal structures were then import into Dragon (ver. 2.1), which can calculate up to 1481 descriptors of 18 types.
The N073 is the number of hetero atom N in a molecule, which is the characteristic structure of studied heterocyclic nitroarenes.
Bulusu, Chemistry and Physics of Energetic Materials, Kluwer Academic Publishers, (1990)

Al-Areqi2 1Department of Chemistry, Aligarh Muslim University, Aligarh-202002, UP India 2Department of Chemistry, Faculty of Applied Science, Taiz Univesity.
The disappearance of fine structures for x ≥ 0.17 in the vanadate anion region shows the presence of crystallographic disordering in the structure of perovskite layers in the tetragonal phase [42-44].
For the sake of visibility of the important sub-lattice peak convergence, which shows the variation in the phase structures as a function of composition, the diffraction data have been graphed in the 2θ range 20-60°.
Venevtsev, Russian Journal of Inorganic Chemistry, 31 (1986) 771 [23] J.L.
Al-Areqi, Journal of the Physics and Chemistry of Solids, 70 (2009) 1007 [49] M.Huve, R.N.

The Influence of Heat and Two Stages Precipitation in the Process of Natural Polymer Purification from the Byproduct of Bioethanol Process Base on Empty Palm Fruit Bunch Achmad Hanafi, Harry Budiman and Fauzan Aulia* Research Center for Chemistry-Indonesian Institute of Sciences Kawasan PUSPIPTEK Serpong, Banten 15314 Indonesia *achmad.hanafi@gmail.com Keywords: biopolymer, lignin, purification, two stages precipitation.
Lignin is a natural polymer product inside cell wall of plant that has three-dimensional poly phenolic structure formed by polymerization of three hydroxycinnamyl alcohols such as p-coumaryl alcohol, coniferyl alcohol, and sinapyl alcohol[8,9].
Black liquor was generated as by-product from hydrolysis of oil palm empty fruit bunch in the bioethanol production pilot plant located in Research Center for Chemistry-Indonesian Institute of Sciences.
Acknowledgement Authors would like to express great gratitude to DIPA 2014 of Research Center of Chemistry, Indonesian Institute of Sciences which is funding this work research.
Stewart, Rapid Assessment of Lignin Content and Structure in Switchgrass (Panicum virgatum L.)

Enhancement of luminescence of YPO4:Eu3+,Yb3+ nanophosphor synthesized by hydrothermal method Jiangming Zhu, Junmei Hu, Jinlong Hao, Aiyin Wang, Yuexiao Pan* Nanomaterials and Chemistry Key Laboratory, Department of Chemistry and Materials Engineering, Wenzhou University, Zhejiang Province, Wenzhou 325027, P.
Results and discussion 3.1 Structure and morphologies The structure of the hydrothermal synthesized product is characterized by XRD in Fig. 1(a).
Further annealing process can drastically improve both the crystallization and luminescence of the luminescent materials obtained by wet-chemistry methods, however, the monodispersed NPs will necessary be agglomerated that will make them unfavorable for application in biological labels.

The PET's chain structure is stiffened by the aromatic groups of the phatic acid comonomer, providing the increased melting point and mechanical properties.
The coextrusion centrifugal fiber-forming apparatus according to the invention was suitable for the production of heat-insulating quilts of both homogeneous and/or mixed fiber structures primarily from virgin plastics.
[4] Shui-Yu Lu, Ian Hamerton, Recent developments int he chemistry of halogen-free flame retardant polymers, Department of Chemistry, Shool of Phisics and Chemistry , University of Surrey, Prog.

Likholobov, Synthesis of Pd/C Catalysts: Approaches to Regulating the Structure of Active Sites to Achieve High Selectivity in the Hydrogenation of Organic Compounds , Russian Chemical Journal. 62(1-2) (2018) 141-159
Obukhov, Studying the Activity of Palladium Catalysts on Ceramic Carriers with Rare Earth Oxide (REO) Additives. , Advances in Chemistry and Chemical Technology. 31(5) (2017) 186
Klyuev, Hydrogenation and Hydroamination in the Presence of Catalysts Based on Platinum and Carbon Nanofibers, Petroleum Chemistry. 56(12) (2016) 1123-1127
Series: Chemistry and Chemical Technology. 61(3) (2018) 10-15
Kirienko, Designing a Structured Catalyst for Selective Reduction of O2 by Hydrogen in the Presence of NO, Catalysis in Industry. 2(4) (2010) 299-306

Most wide band dielectric studies have been made for purely scientific purposes; to study the structure and interactions among binary mixtures, to examine molecular orientations and hydrogen-bonded networks and to study material phase transitions [1].
Because of its outstanding role in chemistry and biology, hydrogen bonding in liquid systems has been intensively studied for long and it is still subject to a lively scientific debate [3].
The fluorinated compounds are also important organic compounds because of their importance to organic chemistry and biochemistry.
Therefore the solution chemistry of these compounds can be strongly influenced by solute-solute and solvent-solute H-bonding interactions, which consequently play an important role in determining the physical properties of these molecules.
While the value of (geff) for 1-PrOH is higher than unity indicating a high degree of coordinated chainlike structures.

Sveinbjörnsson1,2,i 1Science Institute, University of Iceland, IS-107 Reykjavik Iceland 2Competence Centre for III-Nitride Technology C3NiT-Janzén, Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden 3Thin Film Physics Division, Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden 4SweGaN, Olaus Magnusväg 48A, SE-58330 Linköping, Sweden 5Queensland Micro- and Nanotechnology Centre, Griffith University, Brisbane, QLD 4111, Australia 6School of Engineering and Built Environment, Griffith University, Brisbane, QLD, 4111, Australia 7Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden 8Department of Microtechnology and Nanoscience, Chalmers University of Technology, SE-41296 Göteborg, Sweden 9Solid State Physics and NanoLund Lund University, P.O.
Dielectrics such as aluminium nitride (AlN) and aluminium oxide (Al2O3) are of great interest since they are high-k dielectrics. 2H-AlN is of special interest since it has well matching lattice structure to the 4H-SiC, both being hexagonal structures, and only having about 1.2% mismatch between the a lattice parameter [3].

One-Pot Preparation of Carbon Immobilized Nano-Metal Catalysts from Biomass Huimin Yang1,a, Xiaohui Guo2,b, Chunhua Yuan3,c, Jinyan Liu4,d and Wenxiu He5,e 1,2,3,4,5School of Chemistry and Chemical Engineering, Inner Mongolia University of Science & Technology, Baotou 014010, Inner Mongolia, China ayanghuiming920@126.com, bgxhsxicc@163.com, c15848270916@126.com, dliujinyan2007@163.com, e401533416@qq.com Keywords: Biomass, Carbon Materials, Nano-metal, Reduction Amination Abstract.
Introduction Carbon is a versatile and fascinating material that has attracted considerable attentions because of its potential application in catalysis，adsorbents，fuel cells, gas storage and separation, and lithium-ion batteries.[1-4] Carbon materials such as activated carbons, carbon blacks, carbon nanotube and graphite have been used as heterogeneous catalyst or as catalyst supports for decades.[5-6] As we all know, in the heterogeneous catalytic system, the support type, structure and morphology has a large impact on the catalytic activity.
The average Pd particle size was 3-5 nm and the crystal structure of Pd (200) could be observed, Fig. 2a.
,Chen, D. and Wu, Z., Journal of Materials Chemistry A.
Forum Vol. 359 ,(2017), p.1177 [16] Raoufmoghaddam, S., Organic & Biomolecular Chemistry.